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authorLinus Torvalds <torvalds@linux-foundation.org>2024-07-13 16:34:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2024-07-13 16:34:22 -0700
commit4d145e3f830ba2c2745b42bfba5c2f8fcb8d078a (patch)
tree580f34907effe022cbf4a15ca968659fc74c0e64 /drivers
parentd0d0cd38005518533d641e1344537f89cfe95203 (diff)
parent3fdd2d21f1c7f0203575b46d2b3fba81292992b6 (diff)
Merge tag 'i2c-for-6.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang: "Fixes for the I2C testunit, the Renesas R-Car driver and some MAINTAINERS corrections" * tag 'i2c-for-6.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: testunit: avoid re-issued work after read message i2c: rcar: ensure Gen3+ reset does not disturb local targets i2c: mark HostNotify target address as used i2c: testunit: correct Kconfig description MAINTAINERS: VIRTIO I2C loses a maintainer, gains a reviewer MAINTAINERS: delete entries for Thor Thayer i2c: rcar: clear NO_RXDMA flag after resetting i2c: rcar: bring hardware to known state when probing
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/Kconfig2
-rw-r--r--drivers/i2c/busses/i2c-rcar.c27
-rw-r--r--drivers/i2c/i2c-core-base.c1
-rw-r--r--drivers/i2c/i2c-slave-testunit.c7
4 files changed, 30 insertions, 7 deletions
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index 9388823bb0bb..44710267d669 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -135,7 +135,7 @@ config I2C_SLAVE_EEPROM
Documentation/i2c/slave-eeprom-backend.rst for further details.
config I2C_SLAVE_TESTUNIT
- tristate "I2C eeprom testunit driver"
+ tristate "I2C testunit driver"
help
This backend can be used to trigger test cases for I2C bus masters
which require a remote device with certain capabilities, e.g.
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 828aa2ea0fe4..185a5d60f101 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -257,6 +257,14 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv)
}
}
+static void rcar_i2c_reset_slave(struct rcar_i2c_priv *priv)
+{
+ rcar_i2c_write(priv, ICSIER, 0);
+ rcar_i2c_write(priv, ICSSR, 0);
+ rcar_i2c_write(priv, ICSCR, SDBS);
+ rcar_i2c_write(priv, ICSAR, 0); /* Gen2: must be 0 if not using slave */
+}
+
static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)
{
int ret;
@@ -875,6 +883,10 @@ static int rcar_i2c_do_reset(struct rcar_i2c_priv *priv)
{
int ret;
+ /* Don't reset if a slave instance is currently running */
+ if (priv->slave)
+ return -EISCONN;
+
ret = reset_control_reset(priv->rstc);
if (ret)
return ret;
@@ -903,10 +915,10 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
/* Gen3+ needs a reset. That also allows RXDMA once */
if (priv->devtype >= I2C_RCAR_GEN3) {
- priv->flags &= ~ID_P_NO_RXDMA;
ret = rcar_i2c_do_reset(priv);
if (ret)
goto out;
+ priv->flags &= ~ID_P_NO_RXDMA;
}
rcar_i2c_init(priv);
@@ -1033,11 +1045,8 @@ static int rcar_unreg_slave(struct i2c_client *slave)
/* ensure no irq is running before clearing ptr */
disable_irq(priv->irq);
- rcar_i2c_write(priv, ICSIER, 0);
- rcar_i2c_write(priv, ICSSR, 0);
+ rcar_i2c_reset_slave(priv);
enable_irq(priv->irq);
- rcar_i2c_write(priv, ICSCR, SDBS);
- rcar_i2c_write(priv, ICSAR, 0); /* Gen2: must be 0 if not using slave */
priv->slave = NULL;
@@ -1152,7 +1161,9 @@ static int rcar_i2c_probe(struct platform_device *pdev)
goto out_pm_disable;
}
- rcar_i2c_write(priv, ICSAR, 0); /* Gen2: must be 0 if not using slave */
+ /* Bring hardware to known state */
+ rcar_i2c_init(priv);
+ rcar_i2c_reset_slave(priv);
if (priv->devtype < I2C_RCAR_GEN3) {
irqflags |= IRQF_NO_THREAD;
@@ -1168,6 +1179,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
if (of_property_read_bool(dev->of_node, "smbus"))
priv->flags |= ID_P_HOST_NOTIFY;
+ /* R-Car Gen3+ needs a reset before every transfer */
if (priv->devtype >= I2C_RCAR_GEN3) {
priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
if (IS_ERR(priv->rstc)) {
@@ -1178,6 +1190,9 @@ static int rcar_i2c_probe(struct platform_device *pdev)
ret = reset_control_status(priv->rstc);
if (ret < 0)
goto out_pm_put;
+
+ /* hard reset disturbs HostNotify local target, so disable it */
+ priv->flags &= ~ID_P_HOST_NOTIFY;
}
ret = platform_get_irq(pdev, 0);
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index db0d1ac82910..7e7b15440832 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1067,6 +1067,7 @@ EXPORT_SYMBOL(i2c_find_device_by_fwnode);
static const struct i2c_device_id dummy_id[] = {
{ "dummy", 0 },
+ { "smbus_host_notify", 0 },
{ },
};
diff --git a/drivers/i2c/i2c-slave-testunit.c b/drivers/i2c/i2c-slave-testunit.c
index ca43e98cae1b..23a11e4e9256 100644
--- a/drivers/i2c/i2c-slave-testunit.c
+++ b/drivers/i2c/i2c-slave-testunit.c
@@ -118,6 +118,13 @@ static int i2c_slave_testunit_slave_cb(struct i2c_client *client,
queue_delayed_work(system_long_wq, &tu->worker,
msecs_to_jiffies(10 * tu->regs[TU_REG_DELAY]));
}
+
+ /*
+ * Reset reg_idx to avoid that work gets queued again in case of
+ * STOP after a following read message. But do not clear TU regs
+ * here because we still need them in the workqueue!
+ */
+ tu->reg_idx = 0;
break;
case I2C_SLAVE_WRITE_REQUESTED: